When i accelerate my car is usually fine, but 1 in 5 times at full speed the car boggs until i come off the accelerator and re-apply of which works fine.

Any ideas why i get this irregular bog?

I am using the WS7II, which has little over a gallon, and still has lots of compression. I run it around 100c and on the rare occasion has got to no more than 110c

I know the engine is fine and has been broken in well, but i have this problem. Any ideas why it does this. It seems to get a lock or restricted flow but pipes,tank and airfilter ar fine. could it be my clutch, as i am using aluminium 3 pce, and the way that it engages?

I use this as i have melted a few other clutched on this thing.